When humanity reached the pinnacle of civilization, God played a joke on them: He destroyed their old civilization and stripped them of everything, then recreated humanity in a brand-new world of swords and magic. In this world, where demons, dragons, elves, and beastfolk roam everywhere, humans cannot use magic, are weak, cannot fly, and have very short lives. They are good for nothing... They are discriminated against, enslaved, and abused. They are no longer the protagonists of the previous era, but the clowns of this one.
But in the end, they still turned the tables...